In-frame mutations in exon 1 of SKI cause dominant Shprintzen-Goldberg syndrome.
Membres identifiés du Cancéropôle Est :
Pr CALLIER Patrick, Pr VABRES Pierre
Tous les auteurs :
Carmignac V, Thevenon J, Ades L, Callewaert B, Julia S, Thauvin-Robinet C, Gueneau L, Courcet JB, Lopez E, Holman K, Renard M, Plauchu H, Plessis G, De Backer J, Child A, Arno G, Duplomb L, Callier P, Aral B, Vabres P, Gigot N, Arbustini E, Grasso M, Robinson PN, Goizet C, Baumann C, Di Rocco M, Sanchez Del Pozo J, Huet F, Jondeau G, Collod-Beroud G, Beroud C, Amiel J, Cormier-Daire V, Riviere JB, Boileau C, De Paepe A, Faivre L
Shprintzen-Goldberg syndrome (SGS) is characterized by severe marfanoid habitus, intellectual disability, camptodactyly, typical facial dysmorphism, and craniosynostosis. Using family-based exome sequencing, we identified a dominantly inherited heterozygous in-frame deletion in exon 1 of SKI. Direct sequencing of SKI further identified one overlapping heterozygous in-frame deletion and ten heterozygous missense mutations affecting recurrent residues in 18 of the 19 individuals screened for SGS; these individuals included one family affected by somatic mosaicism. All mutations were located in a restricted area of exon 1, within the R-SMAD binding domain of SKI. No mutation was found in a cohort of 11 individuals with other marfanoid-craniosynostosis phenotypes. The interaction between SKI and Smad2/3 and Smad 4 regulates TGF-beta signaling, and the pattern of anomalies in Ski-deficient mice corresponds to the clinical manifestations of SGS. These findings define SGS as a member of the family of diseases associated with the TGF-beta-signaling pathway.
Am J Hum Genet. 2012 Nov 2;91(5):950-7